Dresden 2020 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 55: Computational Materials Modelling - Magnetic Materials
MM 55.6: Talk
Thursday, March 19, 2020, 13:00–13:15, IFW B
Pure Néel-type Spin Textures in Ferrimagnetic Alloys — •Boris Seng1,2,3,4, Daniel Schönke1, Nico Kerber1,3,4, Fabian Kammerbauer1, Jean-Loïs Bello2, Daniel Lacour2, Robert Reeve1, Michel Hehn2, Stéphane Mangin2, and Mathias Kläui1,3,4 — 1Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudinger Weg 7, 55128 Mainz, Germany — 2Institut Jean Lamour, 2 allée André Guinier, 54011 Nancy Cedex, France — 3Max Planck Graduate Center, Staudingerweg 9, 55128 Mainz, Gemany — 4Graduate School of Excellence Materials Science in Mainz, Staudingerweg 9, 55128 Mainz, Germany
Magnetic skyrmions are topologically stabilized spin textures that have been suggested for next generation spintronics devices. Recent studies confirmed the current-driven skyrmion dynamics in ultrathin ferromagnets. However, the Magnus effect leads to a transverse motion of ferromagnetic skyrmions for spin structures with a non-zero topological winding number. Antiferromagnetically exchange-coupled skyrmions or compensated ferrimagnets are expected to suppress this effect owing to an overall zero topological charge. Especially at the angular momentum compensation temperature skyrmions dynamics is predicted to be collinear with the current[1]. Here, we explore GdFeCo ferrimagnetic alloy-based multilayer stacks where a strong Dzyaloshinskii-Moriya interaction is present. In our samples, we observe chiral spin textures such as magnetic skyrmions. The spin distribution of their internal domain walls is imaged and found to be a pure Néel-type.
[1] Barker et al., Phys. Rev. Lett. 116, 147203 (2016)